WO2023158287A1

WO2023158287A1 - Electrode cutting device and method

Info

Publication number: WO2023158287A1
Application number: PCT/KR2023/002462
Authority: WO
Inventors: 이수호
Original assignee: 주식회사 엘지에너지솔루션
Priority date: 2022-02-21
Filing date: 2023-02-21
Publication date: 2023-08-24
Also published as: KR20230125675A

Abstract

The present invention relates to an electrode cutting device and method, the electrode cutting device according to an embodiment of the present invention comprising: a cutter for cutting an electrode sheet into unit electrodes; and a first gripper and a second gripper which are positioned in front of the cutter and fix the electrode sheet from both sides thereof according to an operation of the cutter, wherein the first gripper comprises a first area, and a second area positioned on at least one side of the first area, and the first area of the first gripper may protrude further towards the second gripper than the second area does.

Description

Electrode cutting device and method

Mutual Citation with Related Applications

This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0022579 dated February 21, 2022, and all contents disclosed in the literature of the Korean Patent Application are included as part of this specification.

technology field

The present invention relates to an electrode cutting device and method, and more particularly, to an electrode cutting device and method capable of minimizing displacement of an electrode sheet.

Demand for secondary batteries as an energy source for electronic devices such as mobile phones, laptop computers, and wearable devices or electric vehicles is increasing. Secondary batteries are classified into nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries, lithium secondary batteries, etc. according to the type of electrode. Research and development of lithium secondary batteries with the advantages of high operating voltage and high energy density per unit weight This is actively underway.

In general, a secondary battery may include an electrode assembly and a case in which the electrode assembly is embedded. The electrode assembly may have a structure in which an anode and a cathode are sequentially stacked with a separator interposed therebetween. Unit electrodes such as an anode and a cathode may be manufactured by cutting an electrode sheet manufactured by applying an electrode active material to a unit electrode length. During cutting, since a gripper that grips the electrode sheet comes into direct contact with swells (or wrinkles) of the electrode sheet generated during the roll press process, a defect in which the electrode sheet is displaced may occur. In addition, since the gripper whose position is displaced due to the assembly tolerance of the gripper strongly presses the scallops (or wrinkles) of the electrode sheet, a defect in which the position of the electrode sheet is distorted may occur severely.

An embodiment of the present invention is to provide an electrode cutting device and a cutting method capable of minimizing the occurrence of displacement of an electrode sheet.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

An electrode cutting device according to an embodiment of the present invention includes a cutter for cutting an electrode sheet into unit electrodes; a first gripper and a second gripper located in front of the cutter and fixing the electrode sheet on both sides according to the operation of the cutter, the first gripper having a first area and at least one side of the first area; and a second region located at , and the first region of the first gripper may protrude toward the second gripper more than the second region.

According to an embodiment, the first gripper may press the upper surface of the electrode sheet, and the second gripper may press the lower surface of the electrode sheet.

According to an embodiment, the electrode sheet includes a central region and a peripheral region located on at least one side of the central region, and the first region of the first gripper is the peripheral region of the electrode sheet according to the operation of the cutter. Except for at least a part of the central region may be pressed.

According to an embodiment, the first gripper may include a protrusion disposed on at least a part of the first region and protruding in a direction toward the second gripper.

According to an embodiment, a height difference between the lower surface of the protrusion and the lower surface of the second region of the first gripper may be 0.4 mm to 0.6 mm.

According to one embodiment, the length of the protrusion may be shorter than the length of the unit electrode.

According to an embodiment, the first gripper may include an opening disposed in the second area and concave in a direction opposite to a direction toward the second gripper.

According to an embodiment, a height difference between the bottom surface formed by the opening and the lower surface of the first region of the first gripper may be 4 mm to 6 mm.

An electrode cutting method according to an embodiment of the present invention includes pressing and fixing an electrode sheet from both sides by a first gripper and a second gripper; and cutting the electrode sheet into unit electrodes by a cutter positioned behind the first gripper and the second gripper, wherein the first gripper has a first area and a first area positioned on at least one side of the first area. It includes two regions, and the first region of the first gripper may protrude toward the second gripper more than the second region.

According to an embodiment, the electrode sheet includes a central region and a peripheral region located on at least one side of the central region, and the fixing of the electrode sheet includes the central region excluding the peripheral region of the electrode sheet. Pressing with a protrusion disposed in the first region of the first gripper may be included.

According to an embodiment of the present invention, since the first gripper presses the remaining area of the electrode sheet except for the area around the electrode sheet, the first gripper can avoid direct contact with the area around the electrode sheet. Accordingly, the present invention can prevent positional defects (eg, distortion) of electrode sheets (or unit electrodes) during the lamination process.

In addition, according to an embodiment of the present invention, direct contact between the gripper and the peripheral area of the electrode sheet can be avoided even if the gripper is distorted due to assembly tolerance. Accordingly, the present invention can reduce process defects that may occur due to distortion of the gripper.

In addition to this, various effects identified directly or indirectly through this document may be provided.

1 is an exploded perspective view showing a secondary battery according to an embodiment of the present invention.

2 is a diagram showing an apparatus for manufacturing a secondary battery according to an embodiment of the present invention.

3 is a cross-sectional view showing a gripper included in a cutting device according to an embodiment of the present invention.

4A and 4B are diagrams for explaining an arrangement relationship between a gripper and an electrode sheet included in a cutting device according to an embodiment of the present invention.

5 is a cross-sectional view showing a gripper included in a cutting device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited or limited by the following examples.

In order to clearly describe the present invention, parts irrelevant to the description or detailed descriptions of related known technologies that may unnecessarily obscure the subject matter of the present invention have been omitted, and in this specification, reference numerals are added to the components of each drawing. In the specification, the same or similar reference numerals are assigned to the same or similar components throughout the specification.

In addition, the terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventor appropriately defines the concept of terms in order to best describe his/her invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

Referring to FIG. 1 , a secondary battery 1 according to an embodiment of the present invention may include an electrode assembly 10 and a case 13 surrounding the electrode assembly 10 .

The electrode assembly 10 is a power generating device in which an anode and a cathode are sequentially stacked with a separator interposed therebetween, and may have a stacked or stacked/folded structure. The separator included in the electrode assembly 10 may insulate the positive electrode and the negative electrode from each other.

The electrode assembly 10 may include a plurality of electrode tabs 11 extending from the electrode assembly 10 . The electrode assembly 10 may include a positive electrode tab 111 and a negative electrode tab 112 . The positive electrode tab 111 may extend from the positive electrode of the electrode assembly 10 and protrude to the outside of the electrode assembly 10 . The negative electrode tab 112 may extend from the negative electrode of the electrode assembly 10 and protrude to the outside of the electrode assembly 10 .

An electrode lead 12 may be connected to the electrode tab 11 . For example, the electrode lead 12 may be connected to the electrode tab 11 through a welding process such as laser welding. The electrode lead 12 may include an anode lead 121 and a cathode lead 122 . The positive lead 121 and the negative lead 122 may extend in the same direction or in opposite directions depending on where the positive tab 111 and the negative tab 112 are formed. The positive lead 121 and the negative lead 122 may have different materials. For example, the anode lead 121 may be made of the same aluminum (Al) material as the anode, and the cathode lead 122 may be made of the same copper (Cu) material as the cathode or a copper material coated with nickel (Ni). A part of the electrode lead 12 that protrudes to the outside of the case 13 becomes a terminal part and can be electrically connected to an external terminal.

A portion of the electrode lead 12 may be surrounded by an insulating portion 14 . The insulating part 14 is located in the sealing part 134 where the upper pouch 131 and the lower pouch 132 of the case 13 are thermally fused, and the electrode lead 12 can be adhered to the case 13. . In addition, electricity generated from the electrode assembly 10 is prevented from flowing to the case 13 through the electrode lead 12 and the sealing of the case 13 can be maintained. The insulator 14 is made of a non-conductive material that does not conduct electricity well. As the insulating portion 14, a material that is easy to attach to the electrode lead 12 and has a relatively thin thickness may be used. For example, the insulating portion 14 may be formed of an insulating tape. The material of the insulating portion 14 is not limited to insulating tape, and various members can be used as long as they can insulate the electrode lead 12 .

The case 13 provides a storage space capable of accommodating the electrode assembly 10 and has a pouch shape as a whole. The case 13 may accommodate and seal the electrode assembly 10 so that a portion of the electrode lead 12, that is, a terminal portion is exposed. The case 13 includes an upper pouch 131 and a lower pouch 132 . An accommodation space 133 capable of accommodating the electrode assembly 10 is provided in the lower pouch 132, and an accommodation space 133 in the upper pouch 131 prevents the electrode assembly 10 from escaping from the case 13. (133) at the top. At this time, the accommodation space 133 is also formed in the upper pouch 131, and the electrode assembly 10 may be accommodated at the top. The upper pouch 131 and the lower pouch 132 may be manufactured by connecting one side to each other, but are not limited thereto and may be manufactured in various ways such as being separated from each other and separately manufactured.

At least one of the unit electrodes of the positive and negative electrodes included in the electrode assembly 10 may be manufactured by coating an active material on a sheet-shaped electrode sheet, drying and rolling it, and then cutting the electrode sheet to have a certain size. there is.

2 is a diagram showing an apparatus for manufacturing a secondary battery according to an embodiment of the present invention. The manufacturing device shown in FIG. 2 may be an electrode cutting device.

Referring to FIG. 2 , the electrode cutting device according to an embodiment of the present invention may include a gripper 300 and a cutter 200.

The gripper 300 may be located in front of the cutter 200 based on the direction in which the electrode sheet 100 is supplied. The gripper 300 may grip the electrode city 100 so that the electrode sheet 100 may be cut by the cutter 200 according to the operation of the cutter 200 . When the cutter 200 cuts the electrode sheet 100 into unit electrodes, the gripper 300 adheres to both sides of the electrode sheet 100 to limit the movement of the electrode sheet 100 . The gripper 300 may include a first gripper 310 and a second gripper 320 . The first gripper 310 may contact the upper surface 101 (or the surface facing the first direction D1) of the electrode sheet 100 when the electrode sheet 100 is cut. The second gripper 320 may contact the lower surface 102 (or the surface facing the second direction D2 ) of the electrode sheet 100 when the electrode sheet 100 is cut.

At least one of the first gripper 310 and the second gripper 320 moves in the vertical direction (or in the first direction D1 and/or the second direction D2) to press the electrode sheet 100. can For example, in a state in which the second gripper 320 is fixed, the first gripper 310 moves toward the second gripper 320 in the second direction D2, thereby holding the first and

second grippers

310 and 320. Through this, both sides of the electrode sheet 100 may be pressed.

The cutter 200 may be located behind the gripper 300 based on the direction in which the electrode sheet 100 is supplied. The cutter 200 may include a first cutter 210 and a second cutter 220 . The first cutter 210 may be disposed to face the upper surface 101 of the electrode sheet 100 with the electrode sheet 100 as the center. The second cutter 220 may be disposed on the lower surface 102 of the electrode sheet 100 with the electrode sheet 100 as the center. At least one of the first cutter 210 and the second cutter 220 may move up and down at the cutting position of the electrode sheet 100 . For example, when the electrode sheet 100 is transferred, the first cutter 210 moves upward and downward so that the cutter blade of the first cutter 210 and the cutter blade of the second cutter 220 come into contact with each other, so that the electrode sheet 100 ) can be cut.

According to an embodiment, both sides of the electrode sheet 100 may be pressed by gripping (or gripping) through the first gripper 310 and the second gripper 320 . In a state in which both sides of the electrode sheet 100 are pressed, the electrode sheet 100 may be cut into unit electrodes through the cutter 200 using the first cutter 210 and the second cutter 220 .

Referring to FIG. 3 , a gripper 300 included in a cutting device according to an embodiment of the present invention may include a first gripper 310 and a second gripper 320 .

The first gripper 310 may be disposed to face the second gripper 320 so as to contact the upper surface of the electrode sheet (eg, the upper surface 101 of the electrode sheet 100 of FIG. 2 ) during cutting of the electrode sheet. The first gripper 310 may include a first area A1 and a second area A2 adjacent to the first area A1. In more detail, a lower surface of the first gripper 310, that is, a surface facing the second gripper 320 may include a first area A1 and a second area A2.

The second area A2 may be formed on at least one side of the first area A1. For example, the second area A2 may be formed to surround the first area A1.

At least a portion of the first area A1 of the first gripper 310 may protrude beyond the second area A2 in the second direction D2 toward the second gripper 320 . The first gripper 310 may include a protrusion 400 disposed on at least a part of the first area A1. The protrusion 400 may protrude from the gripper plate 312 of the first gripper 310 toward the second gripper 320 . The protrusion 400 may protrude from the gripper plate 312 of the first gripper 310 in a polygonal shape, or may have at least a portion of the protrusion 400 having a curvature. For example, the protrusion 400 may protrude from the gripper plate 312 of the first gripper 310 in a rectangular shape.

The protrusion 400 may be formed of the same material as the gripper plate 312 of the first gripper 310 or a different material. For example, the protrusion 400 may be formed of the same material as the gripper plate 312 of the first gripper 310 . The protrusion 400 formed of the same material as the gripper plate 312 may be integrally formed with the gripper plate 312 .

The lower surface of the protrusion 400 (eg, the surface facing in the second direction D2) and the upper surface of the second gripper 320 (eg, the surface facing in the first direction D1) are separated by a first separation during the electrode cutting process. They may be spaced apart by a distance d1. The lower surface of the gripper plate 312 disposed in the second area A2 of the first gripper 310 and the upper surface of the second gripper 320 may be spaced apart by a second separation distance d2 during the electrode cutting process. The first separation distance d1 may be different from the second separation distance d2. The first separation distance d1 may be smaller than the second separation distance d2. During the electrode cutting process, the first separation distance d1 has a size corresponding to the thickness of the electrode sheet (e.g., the electrode sheet 100 of FIG. 2), and the second separation distance d2 has a thickness greater than the thickness of the electrode sheet. can have

The height difference (or step difference) s1 between the lower surface of the protrusion 400 and the gripper plate 312 disposed in the second area A2 of the first gripper 310 corresponds to the thickness of the protrusion 400. can A height difference s1 between the lower surface of the protrusion 400 and the gripper plate 312 disposed in the second area A2 of the first gripper 310 may be set in consideration of the thickness of the peripheral area of the electrode sheet. . For example, a height difference s1 between the lower surface of the protrusion 400 and the gripper plate 312 disposed in the second area A2 of the first gripper 310 may range from 0.4 mm to 0.6 mm.

The protrusion 400 may contact a partial region of the electrode sheet fixed between the first gripper 210 and the second gripper 220 during a cutting process of the electrode sheet. The electrode sheet may include a central region and a peripheral region positioned on at least one side of the central region. A central region of the electrode sheet may be surrounded by a peripheral region of the electrode sheet.

The first area A1 of the first gripper 310 on which the protrusion 400 is disposed can press the central area excluding the peripheral area of the electrode sheet according to the operation of the cutter (eg, the cutter 200 of FIG. 2 ). there is. The protrusion 400 may contact the central region of the electrode sheet without contacting the peripheral region of the electrode sheet. The size of the protrusion 400 may be smaller than the size of the unit electrode and/or the gripper plate 312 cut by the cutter. The length L1 of the protrusion 400 may be smaller than the length of the unit electrode. For example, the length L1 of the protrusion 400 may be half the length of the unit electrode.

As such, the lower surface of the protrusion 400 disposed in the first area A1 of the first gripper 310 may come into contact with the electrode sheet during the electrode cutting process. The gripper plate 312 disposed in the second area A2 of the first gripper 320 may not come into contact with the electrode sheet during the electrode cutting process.

Referring to FIGS. 4A and 4B , the electrode sheet 100 may include a central region 110 and a peripheral region 120 . At least a portion of the central area 110 of the electrode sheet 100 may correspond to the first area A1 of the first gripper 310 . At least a portion of the peripheral area 120 of the electrode sheet 100 may correspond to the second area A2 of the first gripper 310 . The surface of the central region 110 of the electrode sheet 100 may be uniformly formed. The peripheral area 120 of the electrode sheet 100 may have a more uneven surface than the central area 110 of the electrode sheet 100 . In the peripheral area 120 of the electrode sheet 100, swells (or wrinkles) are generated in the entire process of the cutting process (eg, an electrode roll press process), so that the peripheral area 120 of the electrode sheet 100 The surface may be non-uniform.

During the cutting process of the electrode sheet 100 , the protrusion 400 of the first gripper 310 may press the electrode sheet 100 . The protrusion 400 of the first gripper 310 may press the central region 110 of the electrode sheet 100 . The protrusion 400 of the first gripper 310 may be formed to avoid the peripheral area 120 of the electrode sheet 100 where a swell is likely to occur. The protrusion 400 of the first gripper 310 may not press the peripheral area 120 of the electrode sheet 100 . The second area A2 of the first gripper 310 may not press the peripheral area 120 of the electrode sheet 100 . In this way, the first gripper 310 may grip a partial region (region excluding the peripheral region 120 ) rather than the entire upper surface of the electrode sheet 100 . Accordingly, in the present invention, positional defects (eg, distortion) of the electrode sheet (or unit electrode) during the lamination process can be prevented.

Also, as shown in FIG. 4B , at least one of the first gripper 310 and the second gripper 320 may be distorted due to assembly tolerance. Even if distortion occurs in the first gripper 310 due to assembly tolerances, the first gripper 310 will not contact (or press) the peripheral area 120 of the electrode sheet 100, which is likely to generate a swell. can Accordingly, in the present invention, positional defects (eg, distortion) of the electrode sheet (or unit electrode) during the lamination process can be prevented.

5 is a cross-sectional view showing a gripper included in a cutting device according to another embodiment of the present invention. In contrast to the gripper 300 shown in FIGS. 3 to 4B, the gripper shown in FIG. 5 replaces the protrusion 400 of the first gripper shown in FIGS. 3 to 4B, instead of the opening 500 of the first gripper 310 ) It may be substantially the same except for having a. Since the description of the remaining components except for the opening 500 of the first gripper 310 may be applied to the description of FIGS. 3 to 4B, overlapping descriptions will be omitted.

At least a portion of the first area A1 of the first gripper 310 shown in FIG. 5 may protrude beyond the second area A2 in the second direction D2 toward the second gripper 320 . The first gripper 310 may include an opening 500 disposed in at least a portion of the second area A2.

The lower surface of the gripper plate 312 disposed in the first area A1 of the first gripper 310 and the upper surface of the second gripper 320 (eg, the surface facing the first direction D1) are used in the electrode cutting process. may be separated by a first separation distance d1. The bottom surface 501 formed by the opening 500 and the top surface of the second gripper 320 may be spaced apart from each other by a second separation distance d2 during the electrode cutting process. The first separation distance d1 may be different from the second separation distance d2. The first separation distance d1 may be smaller than the second separation distance d2. During the electrode cutting process, the first separation distance d1 has a size corresponding to the thickness of the electrode sheet (e.g., the electrode sheet 100 of FIG. 2), and the second separation distance d2 has a thickness greater than the thickness of the electrode sheet. can have

The height difference (or step difference) s2 between the bottom surface 501 formed by the opening 500 and the gripper plate 312 disposed in the first area A1 of the first gripper 310 is ) can correspond to the depth of The height difference s2 between the bottom surface 501 of the opening 500 and the gripper plate 312 disposed in the first area A1 of the first gripper 310 is determined by considering the thickness of the peripheral area of the electrode sheet. can be set. For example, the height difference s2 between the bottom surface 501 formed by the opening 500 and the gripper plate 312 disposed in the first area A1 of the first gripper 310 is 0.4 mm to 0.6 mm. can be mm.

The gripper plate 312 of the first gripper 310 may contact a partial region of the electrode sheet fixed between the first gripper 210 and the second gripper 220 during a cutting process of the electrode sheet. The first gripper 310 may press the central region of the electrode sheet excluding the peripheral region according to the operation of the cutter (eg, the cutter 200 of FIG. 2 ). Due to the opening 500 , the first gripper 310 may contact the central region of the electrode sheet without contacting the peripheral region of the electrode sheet.

The size of the gripper plate 312 in the first area A1 protruding toward the second gripper 320 beyond the bottom surface 501 formed by the opening 500 is the unit electrode and/or gripper plate cut by the cutter. It may be smaller than the size of (312). A length L2 of the gripper plate 312 of the first area A1 protruding from the bottom surface 501 formed by the opening 500 may be smaller than the length of the unit electrode. For example, the length L2 of the gripper plate 312 of the first area A1 protruding beyond the bottom surface 501 formed by the opening 500 may be half the length of the unit electrode.

The lower surface of the gripper plate 312 disposed in the first area A1 of the first gripper 310 may come into contact with the electrode sheet during the electrode cutting process. The gripper plate 312 disposed in the second area A2 of the first gripper 320 may not contact at least a portion of the electrode sheet during the electrode cutting process due to the opening 500 . The gripper plate 312 disposed in the second area A2 of the first gripper 320 may not contact (or press) the peripheral area 120 of the electrode sheet 100 where swells are likely to occur. there is.

In this way, the first gripper 310 may grip a partial region (region excluding the peripheral region 120 ) rather than the entire upper surface of the electrode sheet 100 . Accordingly, in the present invention, positional defects (eg, distortion) of the electrode sheet (or unit electrode) during the lamination process can be prevented.

According to an embodiment, in a partial area of the second area A2 of the first gripper 310, the thickness of the gripper plate 312 is the gripper plate disposed in the first area A1 as shown in FIG. 5 . It may be formed thinner than the thickness of (312). As shown in FIG. 5, the opening 500 extends from the lower surface of the gripper plate 312 (eg, the surface facing the second direction D2) to the upper surface of the gripper plate 312 (eg, the first direction D1). face) may be formed in the shape of a concave groove. In the remaining areas of the second area A2 of the first gripper 310, the thickness of the gripper plate 312 may be the same as the thickness of the gripper plate 312 in the first area A1. In this case, the gripper plate 312 may come into contact with a portion of the peripheral area 120 of the electrode sheet 100 where swells are likely to occur, but the gap between the gripper plate 312 and the electrode sheet is caused by the opening 500. Contact area can be minimized. Accordingly, positional defects (eg, distortion) of the electrode sheet (or unit electrode) during the lamination process can be minimized.

According to another embodiment, the opening 500 is disposed in the entire area of the second area A2 of the first gripper 310, and the thickness of the gripper plate 312 is disposed in the first area A1. ) may be formed thinner than the thickness of In this case, the gripper plate 312 may not be in contact with the entire peripheral area of the electrode sheet 100 where swells are likely to occur. Accordingly, it is possible to prevent positional defects (eg, distortion) of the electrode sheet (or unit electrode) during the lamination process.

Although the present invention has been described above with limited embodiments and drawings, the present invention is not limited thereto, and is described below and the technical spirit of the present invention by those skilled in the art to which the present invention belongs. Various implementations are possible within the scope of equivalence of the claims to be made.

[Description of code]

1: secondary battery 10: electrode assembly

100: electrode sheet 200: cutter

300: gripper 400: protrusion

500: opening

Claims

a cutter for cutting the electrode sheet into unit electrodes;

A first gripper and a second gripper located in front of the cutter and fixing the electrode sheet from both sides in accordance with the operation of the cutter,

The first gripper includes a first area and a second area located on at least one side of the first area,

The electrode cutting device of claim 1, wherein the first area of the first gripper protrudes toward the second gripper more than the second area.
According to claim 1,

The first gripper presses the upper surface of the electrode sheet,

The electrode cutting device wherein the second gripper presses the lower surface of the electrode sheet.
According to claim 1,

The electrode sheet includes a central region and a peripheral region located on at least one side of the central region,

The first region of the first gripper presses the central region excluding at least a portion of the peripheral region of the electrode sheet in accordance with the operation of the cutter.
According to claim 1,

The first gripper,

An electrode cutting device comprising a protrusion disposed on at least a portion of the first region and protruding in a direction toward the second gripper.
According to claim 4,

The height difference between the lower surface of the protrusion and the lower surface of the second region of the first gripper is 0.4 mm to 0.6 mm.
According to claim 4,

The length of the protrusion is shorter than the length of the unit electrode electrode cutting device.
According to claim 1,

The first gripper,

An electrode cutting device comprising an opening disposed in at least a portion of the second region and concave in a direction opposite to a direction toward the second gripper.
According to claim 7,

The electrode cutting device of claim 1 , wherein a height difference between a bottom surface formed by the opening and a lower surface of the first region of the first gripper is 4 mm to 6 mm.
pressing and fixing the electrode sheet from both sides by the first gripper and the second gripper;

Cutting the electrode sheet into unit electrodes by a cutter positioned behind the first gripper and the second gripper,

The first gripper includes a first area and a second area located on at least one side of the first area,

The electrode cutting method of claim 1 , wherein the first area of the first gripper protrudes toward the second gripper more than the second area.
According to claim 9,

The electrode sheet includes a central region and a peripheral region located on at least one side of the central region,

In the step of fixing the electrode sheet,

and pressing a central region of the electrode sheet excluding a peripheral region with a protrusion disposed in a first region of the first gripper.